Boiler-furnace.



E. R; F'ISH.

BUILER FURNCE- Armcmon mm sm. 2s.

HIE.

Patented May 29, 1917.

n I Willi-ll Enwaans'n. FISH, or wnns'rnn Gnovns, mIssoUnI.

BOILEB-FUBNACE.

Bpeccation o! Letters Yatent.

Patented May e9, 1917.

Application flied September 25, 1916. Serial No. 122,096.

To all 'whom it may concern Be it known that I, EDWARDS R. FISH, a citizen of the United States, residing at Webster Groves, Missouri, have invented a certain new and useful Improvementin Boiler-Furnaces, of which the following is a full, clear, and exact description, such as will enable others skilled in the art to which it appertains to make and use the same.

'This invention relatesto furnaces of the type that are used in connection with steam bollers.

Prior to my invention it was the usual practice, whenever a superheater was used with a steam boiler, to either arrange the superheater in such a position that it was su jected to the action of practically all of the furnace gases, or arrange the superheater in a chamber at the top of the boiler setting, which chamber was connected with the fire box. or gas duct of the furnace by a iue or ues formed in a side wall of the furnace.

Ifthe superheater is subjected to the action of practically all of the furnace gases it is impossible` -to accurately control the degree of superheat, and if the superheater is arranged at the top ofthe boiler setting, the full eiciency of the gases used to heat the superheater is not utilized. Furthermore, considerable is added to the cost of building the furnace if a flue or iues are formed in the side wall of the furnace to conduct the 'gases to the superheater chamber.

One object of my invention is to provide a boiler furnace which is so designed that a superheater can be used with the boiler without the necessity of constructing a iiue or iiues in the side wall of the furnace or changing the boiler setting, thereby reducing the cost of building the furnace and also enabling a superheater to be added with very little trouble after the boiler has been nstalled.

inother object is to provide a boiler fure which is equipped with a superheater arranged in such a manner that'the degree of superheat can be accurately controlled and practically the full eiiiciency of the gases supplied to the superheater utilized. To this end I have devised a boiler furnace provided with a superheater chamber arranged behind the bridge wall of the furnace in the combustion, ash or dust chamber; that is, the chamber, or space between the bridge wall and the rear wall of the furnace, said chamber being connected with the tire from said chamber, and thereafter flow over a part of the boiler in which steam is generated. My invention is a plicable to furnaces for fire tube boilers an water tube boilers equipped with either vertical or horizontal baflles and heated by gas, liquid or solid fuel. Figure 1 of the drawings is a vertical longitudinal sectional view of a water tube boiler provided with a furnace constructed in accordance with my invention and equipped with vertically-disposed batlles, the furnace being heated by waste gases; and

Fig. 2 is a similar view, illustrating a furnace constructed in accordance with my invention, used with a boiler provided with horizontally-disposedbaiiles, and heated by coal or solid fuel.

Referring to the drawin which illustrate the preferred form o my invention, A designates the drum, and B designates the tubes of a water tube boiler, said drum and' Water tubes being arranged in a substantially horizontal position over a furnace that is provided with either a gas duct C, as shown in Fig. 1, in which waste ses are supplied, or a lire bex C', as shown 1n Fig. 2, in which coal or other solid fuel is burnt. The furnace is provided with a bridge wall D that separates the combustion, ash or dust chamber E from the gas duct C or the fire box C', and ballles F are provided for causing the furnace gases to ow in a tortuous passage over the tubes of the boiler in traveling to the flue G that leads to the stack (not shown), the baliles of the boiler shown in Fig. 1 being arranged vertically, and those of the boiler shown in Fig. 2 being arranged horizontally.

A superheater H, of any preferred design, is connected with the drum A by a conduit 1 or in any other suitable manner, so that the steam generated in the boiler will pass through the superheater H before it reaches the point where it is utilized. Said superheater H is arranged in the chamber or space E between the rear wall of the furnace and the bridge wall D and one or more ports 2 are formed in said bridge Wall so that some of the furnace gases can pass directly from the gas duct C or fire box C and act on the superheater H. The superheater is preferably arranged in a chamber the boiler to the flue G that leads to thel stack. Various means may be used for controlling the supply of furnace gases tothe superheater chamber, but I prefer to govern the outlet port or ports 3 of the superheater chamber by a, damper or dampers 4 that can be regulated either manually or by an automatic temperature controller (not shown). When the damper or dampers 4 are open', as shown in the drawingsz some of the furnace gases will be drawn into the superheater chamber I by the suction created in said chamber by the stack draft, thereby causing the superheater to be acted upon by the furnace gases when said gases are most efficient. After acting on the superheater, the gases escape from the superheater chamber I and flow upwardly over the tubes B of the boiler, thereby causing the remaining available heat units in the utilized.

By arranging the sulerheater in 'a cha-mber located in the com ustion, ash or dust chamber, behind the Bridge wall, and providing means whereby any desired quantity of gases may be taken from the fire box or gas duct of the furnace, circulated through the superheater chamber and then allowed toescape from said chamber, I am able to accurately control the degree of superheat. Furthermore, as the gases used to heat the gases to be' duct, and after acting on the lsuperheater,

flow over the tubes of the boiler in escaping to the stack flue, greater efhciency in the operation of the furnace is attained. Such a furnace can be built at a lower cost than a furnace having flues in its side wall, and still another desirable feature of such a furnace is that it makes it possible to combine a superheater with the without reconstructing the furnace.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is: t

A boiler furnace provided with a superheater chamber, a superheater arranged in said chamber, a bridge wall which separates said chamber from the re box of the furnace, said bridge Wall being provided with an opening which establishes communication between said chamber and'fire box, a partition wall which separates said superheater chamber from the combustion chamber of the furnace, and a valve in said wall which regulates the quantity of hot, gases which enter said superheater chamber through'the opening 'in the bridofe wall andwhich also permits the gases which have been utilized t0 hea't the superheater to thereafter pass into the combustion chamber and be fur'- ther utilized to heat the tubes of theboiler, said valve being arranged adjacent the rear end of said superheater chamber.

EDWARDS R. FISH.

boiler at any time 

